Add RFC6598 to RESERVED networks def
Add RFC6598 to RESERVED networks def

ryantierney513/capirca,google/capirca,jethrogb/capirca,pettai/capirca,rarcotvmw/capirca,google/capirca,jethrogb/capirca,pettai/capirca,ryantierney513/capirca,sneakywombat/capirca,google/capirca,sneakywombat/capirca,ryantierney513/capirca,rarcotvmw/capirca,sneakywombat/capirca,rarcotvmw/capirca,google/capirca